直线l：ax+y-2-a=0在x轴和y轴上的截距相等，则a的值是[ ]
A.1
B.-1
C.-2或-1
D.-2或1
答案：D
The deadline has been ________ till next Monday.
A．enlarged
B．expanded
C．extended
D．increased
保护层用（）厚的镀锌铁皮或黑铁皮包于防潮层表面，用它可以保护保温层。
A.0.2mm
B.0.3mm
C.0.4mm
D.0.5mm
